Practice problem
Phospholipid — Structure & Function
By Kcwang at English Wikibooks (Transferred from en.wikibooks to Commons.) [Public domain], via Wikimedia Commons
Pictured above in red is an integral membrane protein, or a protein that spans the entire length of a phospholipid bilayer. It associates with both the hydrophilic heads and the hydrophobic tails of the phospholipid bilayer. Based on this information, it must be. . .